Summary of Significant Accounting Policies - Schedule of Future Amortization Expense (Details) $ in Thousands	Jun. 30, 2019 USD ($)
Accounting Policies [Abstract]
July 1 to December 31, 2019	$ 937
2020	1,871
2021	1,871
2022	591
2023	336
Thereafter	1,917
Total	$ 7,523

Deferred Costs and Finite-Lived Intangible Assets, Amortization Expense, After Year Five

No definition available.

Name:	nshi_DeferredCostsandFiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive
Namespace Prefix:	nshi_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Deferred Costs and Finite-Lived Intangible Assets, Amortization Expense, Remainder of Fiscal Year

No definition available.

Name:	nshi_DeferredCostsandFiniteLivedIntangibleAssetsAmortizationExpenseRemainderofFiscalYear
Namespace Prefix:	nshi_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Deferred Costs and Finite-Lived Intangible Assets, Amortization Expense, Year Five

No definition available.

Name:	nshi_DeferredCostsandFiniteLivedIntangibleAssetsAmortizationExpenseYearFive
Namespace Prefix:	nshi_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Deferred Costs and Finite-Lived Intangible Assets, Amortization Expense, Year Four

No definition available.

Name:	nshi_DeferredCostsandFiniteLivedIntangibleAssetsAmortizationExpenseYearFour
Namespace Prefix:	nshi_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Deferred Costs and Finite-Lived Intangible Assets, Amortization Expense, Year Three

No definition available.

Name:	nshi_DeferredCostsandFiniteLivedIntangibleAssetsAmortizationExpenseYearThree
Namespace Prefix:	nshi_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Deferred Costs and Finite-Lived Intangible Assets, Amortization Expense, Year Two

No definition available.

Name:	nshi_DeferredCostsandFiniteLivedIntangibleAssetsAmortizationExpenseYearTwo
Namespace Prefix:	nshi_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Deferred Costs and Finite-Lived Intangible Assets, Net

No definition available.

Name:	nshi_DeferredCostsandFiniteLivedIntangibleAssetsNet
Namespace Prefix:	nshi_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

No definition available.

Name:	us-gaap_AccountingPoliciesAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration